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testing/preact.js
64 строки
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Jake Fried
bento unit tests: flush all hooks/renders after each test run (#36261)
12 окт 2021, 17:50
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12 окт 2021, 17:50
df11f9e
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import * as preact from /*OK*/ 'preact'; /** * This file introduces a helper for draining Preact's queue of renders and effects. * We use this as part of the afterEach() cleanup in unit tests, to ensure no effects are run * in subsequent tests. * * There is still a test isolation issue in that an effect can asynchronously schedule work * which cannot be guarded from at this layer. For that we'd likely need to refresh the window * in between each test run. * * We should be able to remove this file if this feature lands in Preact. * @fileoverview */ const rafs = []; /** * @param {(ts: (DOMHighResTimeStamp) => number)} cb * @return {number} */ function flushableRaf(cb) { rafs.push(cb); return requestAnimationFrame(flushRaf); } function flushRaf(ts = performance.now()) { for (const raf of rafs) { raf(ts); } rafs.length = 0; } let pendingRender; /** * @param {() => void} process * @return {Promise<void>} */ async function flushableRender(process) { pendingRender = () => { pendingRender = null; return process(); }; await Promise.resolve().then(pendingRender); } /** * Flushes Preact renders and effects. * * Effects may queue up further rerenders, etc. etc, * so this function will loop until everything to resolves. * * @return {Promise<void>} */ export async function flush() { flushRaf(); while (pendingRender) { await pendingRender(); flushRaf(); } } preact.options.requestAnimationFrame = flushableRaf; preact.options.debounceRendering = flushableRender;